A5053424948- Wind Energy Research and Development
- Fluid Dynamics and Vibration Analysis
- Wave and Wind Energy Systems
- Wind and Air Flow Studies
- Wind Turbine Control Systems
- Advanced Optical Sensing Technologies
- Methane Hydrates and Related Phenomena
- Icing and De-icing Technologies
- Geophysics and Gravity Measurements
- Offshore Engineering and Technologies
- Energy Load and Power Forecasting
- Photovoltaic System Optimization Techniques
- Real-time simulation and control systems
- Remote Sensing and LiDAR Applications
- Geophysical Methods and Applications
- Advanced Multi-Objective Optimization Algorithms
- Atmospheric and Environmental Gas Dynamics
- Particle Accelerators and Free-Electron Lasers
- Vibration and Dynamic Analysis
- Underwater Acoustics Research
- Seismic Waves and Analysis
- Advanced Fiber Optic Sensors
- Superconducting Materials and Applications
- Probabilistic and Robust Engineering Design
- Thermal Analysis in Power Transmission
National Renewable Energy Laboratory
2021-2025
University of Colorado Boulder
2016-2022
University of Virginia
2020
Colorado School of Mines
2020
University of Illinois Urbana-Champaign
2020
University of Colorado System
2019
Abstract. This paper describes the development of a new reference controller framework for fixed and floating offshore wind turbines that greatly facilitates tuning represents standard industry practices. The turbine controllers are most commonly cited in literature have been developed to work with specific turbines. Although these provided control functionalities, they often not easy modify use on other turbines, so it has challenging researchers run representative, fully dynamic...
Abstract. This paper describes the development of a new reference controller framework for fixed and floating offshore wind turbines that greatly facilitates tuning represents standard industry practices. The turbine controllers are most commonly cited in literature have been developed to work with specific turbines. Although these provided control functionalities, they often not easy modify use on other turbines, so it has challenging researchers run representative, fully dynamic...
Wind energy is recognized worldwide as cost-effective and environmentally friendly, it among the fastest-growing sources of electrical energy. To further decrease cost wind energy, turbines are being designed at ever-larger scales. expand deployment also on floating platforms for placement in deep-water locations offshore. Both larger-scale pose challenges because their greater structural loads deflections. Complex, large-scale systems such modern increasingly require a control co-design...
Abstract The cost of wind energy can be reduced by controlling the power reference a turbine to increase capture, while maintaining load and generator speed constraints. We apply standard torque pitch controllers direct inputs use their set points change output reduce blade transients. A controller increases when conditions are safe decreases it problematic transient events expected. Transient speeds loads estimated using gust measure derived from estimate. hybrid rating maximum allowable...
Abstract A new frequency-domain dynamics model has been developed that uses open-source components to efficiently represent a complete floating wind turbine system. The model, called RAFT (Response Amplitudes of Floating Turbines), incorporates quasi-static mooring reactions, strip-theory and potential-flow hydrodynamics, blade-element-momentum aerodynamics, linear control. formulation is compatible with wide variety support structure configurations no manual or time-domain preprocessing...
Abstract. The dynamic behaviour of Floating Offshore Wind Turbines (FOWT) involves complex interactions multivariate loads from wind, waves, and currents, which result in motion characteristics. Although methods for analysing global responses are well-established, the time- location-dependent kinematics remain underexplored. This paper investigates Instantaneous Centre Rotation (ICR), a point zero velocity at time instance general plane motion. Understanding strategically positioning ICR can...
Abstract. We examine the effect of rotor design choices on power capture and structural loading each major wind turbine component. A harmonic model for is derived from simulations using National Renewable Energy Laboratory (NREL) aeroelastic code FAST to reduce computational expense while evaluating trade-offs rotors with radii greater than 100 m. Design studies are performed, which focus blade aerodynamic parameters as well different hub configurations nacelle placements atop tower. The...
Abstract. This article presents a validation study of the popular aeroservoelastic code suite OpenFAST leveraging weeks measurements obtained during normal operation 2.8 MW land-based wind turbine. Measured conditions were used to generate one-to-one turbulent flow fields (i.e., comparing simulation measurement in 10 min increments, or bins) through unconstrained and constrained assimilation methods using kinematic turbulence generators TurbSim PyConTurb. A total 253 bins turbine selected...
The American WAKE ExperimeNt (AWAKEN) is a multi-institutional field campaign focused on gathering critical observations of wind farm–atmosphere interactions. These interactions are responsible for large portion the uncertainty in plant modeling tools that used to represent performance both prior construction and during operation can negatively impact energy profitability. AWAKEN will provide data validation, ultimately improving lowering these uncertainties. designed address seven testable...
We study the fatigue loading experienced by wind turbines using yaw control to redirect wakes. First, through aeroelastic simulations, loads of a turbine equipped with baseline and individual pitch controller are analyzed for operating constant misalignment. Second, two-turbine plant wakes is optimized energy capture different inflow angles. That law then used distribution directions determine how often at what angle an upstream would operate Finally, data from initial simulations...
Abstract. We develop an automated controller tuning procedure for wind turbines that uses the results of nonlinear, aeroelastic simulations to arrive at optimal solution. Using a zeroth-order optimization algorithm, using controllers with randomly generated parameters are used estimate gradient and converge set those parameters. use kriging visualize design space uncertainty, providing level confidence in result. The is applied three problems turbine control. First, below-rated torque...
Abstract This article presents the development of Control‐oriented, Reconfigurable, and Acausal Floating Turbine Simulator (CRAFTS). CRAFTS has a modular, hierarchical model architecture that enables rapid accurate simulation wind turbines. The facilitates incorporation variants, its system reconfiguration features help simulate multiple design variants. also supports integration models developed on causality‐free platform (e.g., Modelica®) with existing causal models. focuses validation...
Abstract This paper discusses a framework to design elements of the plant and control systems for floating offshore wind turbines in an integrated manner using linear parameter-varying models. Multiple linearized models derived from aero-elastic simulation software different operating regions characterized by incoming speed are combined construct approximate low-fidelity model system. The is then used generate open-loop, optimal trajectories as part nested co-design strategy that explores...
Abstract. Wind turbines are complex multidisciplinary systems that challenging to design because of the tightly coupled interactions between different subsystems. Computational modeling attempts resolve these couplings so we can efficiently explore new wind turbine early in process. Low-fidelity models computationally efficient but make assumptions and simplifications limit accuracy studies, whereas high-fidelity capture more actual physics with increased computational cost. This paper...
We present the models used in simulation and control of a segmented, ultralight, morphing rotor (SUMR). These simplified, linear highlight some differences between SUMR concept conventional designs. The also aid controller development turbine design. A baseline is presented for SUMR. To demonstrate how simplified can be system optimization, we actuator requirements adequate closed-loop performance. Full, nonlinear, aero-elastic simulations are performed to fine tune competing objectives....
Reduced scale wind turbines can be extremely cost-effective to test new rotor concepts since prototype costs are heavily dependent on the diameter. Ideally, scaled model would have same non-dimensional deflections, dynamics, and control behavior as full-scale model. This provide a high-fidelity demonstration of performance, which is ideal if turbine has significant aeroelastic interactions. To this end, servo-aero-gravo-elastic (SAGE) scaling developed applied 13-MW that 20% The preserves...
Abstract Wind turbine design encompasses many different aspects including aerodynamic, structural, electrical, and control system design. To achieve optimal plant performance, a approach is utilized in which the performance of whole wind evaluated quantified during operational scenarios with subsystem interactions. In this paper, for Segmented Ultralight Morphing Rotor (SUMR) 50‐MW presented utilizing levelized cost energy (LCOE) choices, additional quantification simulated shortcomings at...
Typical wind turbine controllers are designed to regulate generator power some fixed, rated value. We demonstrate a regulator that uses speed measurements control the rating, increasing capture more and decreasing mitigate peak blade loads speeds occur in extreme turbulent gusts. The existing, industry-standard loops provide direct inputs is based on constraints drive design limits operation. While maintaining operation within prescribed limit, we able 2.45% by changing using relatively...